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Your cart is empty.Spark Plug Hole Thread Chaser
Spencer D.
2025-09-04 14:06:50
A tool you may not use very often, but l used it for a stripped out O2 sensor fitting and it restored the threads so the new sensor threaded in perfectly.
Zero Signal
2025-07-27 14:10:09
Every once in a while I run into a spark plug or oxygen sensor that fights me on the way out. I've run into enough galled threads that I scrupulously use anti-seize compound on both, but anti-seize won't help you if the threads are damaged or full of trash-- or if the last guy forgot to use it.I've found that if I'm careful removing things, I can usually clean up the threads with a thread chaser and they'll be fine. I don't like using a tap if I can avoid it because taps tend to remove more material, and I want to preserve as much of the metal as I can. Most times a thread chaser is enough to get things back on track.I've used Lisle tools for years. They are usually a good balance point between quality and price. This chaser is no exception. I use this whenever I replace an oxygen sensor and sometimes when I replace spark plugs. The $7 that it costs is NOTHING compared to the headaches that it will solve if you accidentally damage or cross-thread something. If you do your own maintenance work, you should have one.
Stigy
2025-07-20 15:21:08
Worked perfectly, use a little grease on the threads to capture any metal.
Tuan
2025-07-19 20:41:41
This chaser looks to be of good quality but unfortunately I realize too late that since it also cuts 18mm threads, it has to be large and uses 13/18" socket which will not fit into my 97 Miata's spark lug hole. So be sure to test if your socket fits into your spark plug hole before buying. If it does not, I recommend buying Lisle's other chaser that is for 14mm threads only.
C. Huss
2025-06-18 14:25:43
One of those tools that won’t get much use but is worth its weight in gold when you need it. Been happy with all Lisle tools.
The Greek
2025-05-06 15:37:13
As expected lisle tools are great quality. This is something you should always have in your toolbox especially if you work on your own stuff and change the plugs.
Gwyt
2025-05-05 12:09:39
I was replacing the o2 sensor on a bmw 3.0 and I could tell the threads were galling and if I were to finish removing the sensor, I may not be able to get the new one back in. I found this one on amazon and sure enough the 18 x 1.5 was the correct match. I strong armed the sensor out and the threads were in bad shape. All the threads from the sensor were gone and much of the material was in the the threads of the exhaust manifold. I used a deep impact socket and a breaker bar. The o-ring proved very worthy here as it slid up in the socket and held its place without falling out. Even being pushed all the way in the socket, it left plenty of the chaser tool exposed. I began turning and applying pressure to get it threading into the exhaust manifold. Since this isn't a tap for true thread cutting, it would get tight and hard to turn. The name of the game here is tighten it and back it off, back and forth, around an 1/8 to 1/4 turn at a time. This is why I used the breaker bar, a ratchet would continually have to have the direction switched to go back and forth which is a pain. As you keep threading it in further and doing the back and forth, you can feel it loosening as it clears threads. Every time you back it off, you try to slightly advance the turn, until you get all the way through. I sprayed a little WD40 occasionally to help with the friction as it will get warm to hot.In conclusion this thread chaser worked perfectly and ultimately saved the day! Lisle tools have always been a quality go to for me. The thought of replacing the exhaust manifold and the headaches that one can encounter doing that job, were happily avoided.I helped my son do this job. The value of patience and making sure you have the right tools to do the job, really shined through here!BTW: I used a standard o2 sensor socket to start with. After about 1 full turn it got real tight, where then the socket splayed and jumped, which suggested the threads were galling. Ultimately I had to clip the wires on the sensor and remove the upper parts of it to get a regular deep well socket on to get it out. An o2 sensor socket is longer than a standard deep well socket. Hopefully this may prove helpful to someone else with the same problem
Snacks
2025-04-13 16:30:48
Good
Jonathan Bonin Bourgault
2025-03-04 12:51:48
Did amazing! I can now thread my spark plug easily by hand. Don't forget to put some kind of grease on it to catch any filings. In my case, I had bearing grease on hand.
DUDLEY
2025-02-13 14:56:09
I was concerned that this would make the threads worse but it worked perfectly. Remember to vaccum or blow out the cylinder after to get out any metal filings
Brent R Nassichuk
2025-01-01 09:34:52
This is the first time I've used a thread chaser. My mistake in cross threading the spark plug. I did a number on it and the thread chaser was able to get me realigned and running again. Make sure to use proper grease to ensure the metal cuttings are removed and don't cause engine damage.
Customer
2024-12-20 10:45:50
It did its job to make a new thread.
Customer
2024-12-07 11:13:18
Worked perfectly for chasing cylinder head spark plug hole
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